Hydraulic brake



Nov. 15, 1 932.

c. R. SHARAR HYDRAULIC BRAKE File d March 14, 1936 Tayen 150 1.".

CA? Swim F M aldivmze ys Patented Nov. 15, 1932 i UNITED STATES PATENT OFFICE;

Application filed March 14, 1931. Serial No. 522,613. ,1

This invention relates to improvements in in acylinder16, this piston being attached to hydraulic brakes. a connecting rod 17 which is in turn attached The principal object of the invention is to to the slider 13. v provide a brake wherein the braking force is A valve is shown at 18 which valve is actu-. caused by a fluid passing through a restricted ated by acontrol lever '19 for the purpose of opening which opening may be varied in ac transmitting fluid pressure to a point above cordance with the drivers wishes. or below the piston 14. duct 21 connects A further object is to limit the use of fricthe bottom part of the chamber 12 with the tion bands, drums and the like which are eastop part thereof and acts as a by-pass around. it fl h t d, squeak d g b, the slider 13. The slider 13 has a peculiarly A still further object is to produce a device shaped interior chamber 22. This chamber which may be attached to any motor vehicle has p0rts 23 and Within which check valves without materially altering the construction 26 and 27 are positioned. Leadlng from these of the same. 7 check valves are passages 28 and 29, which 15 Other objects and advantages will be apextend through the slider cast-ing and open at parent during the course of the following dethe bottom thereof. scription. The result of this construction is that when In the accompanying drawing forming a the control rod 12 is moved to operate the part of this specification and in which like valve 18 p re lsadmitted so that the pisnumerals are employed to designate like parts ton 14 1s moved to its upper limit thus raisthr gh ut th a ing theslider 13 tothe upper limit, then the Figure 1 is a diagrammaticillustration of oil contained within the casting 5 will be my d i as th a would appear when beneath the slider or reservoir A. At this attached to the transmission shaft of a'motor time the shaft 6 will be centrally positioned.- Ze Vehicle, in the circle described by the ends of the Figure 2 is a cross sectional view enlarged, vane 7 when the slider 13 is in its mid-way taken on the line 2-2 of Figure 3, position; that is when the ball 9 is" in the Figure 3 is a cross sectional iew taken on recess 11. In this pOSi'tiOIl the Oil Within the the line 33 of Figure 2, and chamber 22 is merely rotated around and has Figure 4is a fragmentary detail View showno restraining efiect uponthe shaft 6.

ing the brake in partial braking position. Assuming now that it is desired to brake Applicant is aware of the fact that efforts the vehicle to which the device is attached or, have been made to produce hydraulic brakes slow it down partially, the valve 18 is manip but these efforts have failed for the reason ulated so that the piston 14 is depressed, the

35 that the oil would form, heat and therefore amount of depression controlling the amount would not function the same at all times. of retarding action. As soon as the slider Applicant has produced a very simple destarts to travel downwardly, oil in the chamvice which consists of a casting 5 which is ber A will be transferred through the bypass supported upon a motor vehicle in any con- 21 to the reservoir B. At the same time if venient manner. This casting has the prothe chamber 22 should be partially empty, oil 98 peller shaft 6 passing therethrough to which will be sucked in through the passage 29, pass propeller shaft is attached a sliding vane 7. the check valve 27 and into the chamber 22. This vane is retained in the shaft by a ball 8 The same action will be true of the check which travels in a race 9 and is adapted to valve 26. If the slider moves down as indie seat in the recess 11 when the brake is entirely catedin Figure 4, the oil being pumped 0 off. Within the casting 5 is a chamber 12 around by the sliding vane 7, must pass and slidable within this chamber is a slider through the restricted opening between the 13. This slider is moved within the chamshaft 6 and the point'C. As this distance ber 12 from the top tothe bottom thereof becomes smaller it is evident that more brak- 50 through the-medium of a piston 14 traveling ing force is being transmitted from the sliding vane 7 to the shaft 6, and when the slider 13 reaches its bottom position as shown in Figure 2 it will be seen that the point C has come into contact with the shaft 6 and therefore it will be impossible for the sliding vane 7 to pump any more out therebetween and consequently a dead stop results.

It is to be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the same and that various changes relative to the material, size, shape, and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claim.

A :Having thus described my invention, I claim 1+ y In a device of the character described, a casting having a chamber formed therein, a piston-like slider positioned within said vchamber and engaging the walls of said chamber, whereby when sa d slider is centrallypositioned with respect to said chamber separate chambers will be formed on opposite sides of said slider, a piston secured to said slider whereby said sllder may be moved, means for actuatlng said piston, a

rotating shaft extending through said casting and said slider, a sliding vane carried by said shaft, a fluid positioned within said slider and adapted to be acted upon by said vane, a bypass connecting the top and bottom of said chamber whereby fiuidin said chamber 7 may be bypassed around said slider, passage waysformed in said slider, said passage-ways communicating with the chamber formed at one end of said slider, valves positioned in said passage ways, and means for mainta'ning said vane in a fixed position when said slider has been moved a predetermined position with relation to said shaft.

In testimony whereof I aflix my signature.

CHESTER R. SHARAR. 

